Occurrence (presence/absence) of Turbellaria on algae and Posidonia oceanica sampled between 06 May 1982 and 22 November 1983 at Calvi Bay (Corsica). The data were digitized by VLIZ from the original report: Martens, P.M. (1983). Periphytale Turbellaria in de Baai van Calvi, in: FKFO Project 2.9007.82. Systematiek en ecologie van mariene organismen: verslag over het tweede werkingsjaar 1983. pp. 71-73.